[ImgBot] Optimize images

*Total -- 679.72kb -> 410.04kb (39.67%)

/images/computer.png -- 2.57kb -> 1.38kb (46.43%)
/images/ananya.png -- 605.54kb -> 356.51kb (41.12%)
/images/cloud.png -- 3.81kb -> 2.25kb (41.07%)
/images/mountain.png -- 64.32kb -> 46.54kb (27.64%)
/images/index.png -- 3.49kb -> 3.36kb (3.47%)

Signed-off-by: ImgBotApp <[email protected]>

Author: ImgBotApp